Analysis seems to work. Display of graph wrong.

Not yet tested at all.

Various doc work

This simply forwards incoming LightResult.
Rename RefNode::new -> RefNode::from_node to fix clippy warnings.

The node RealLens is missing in the repo..

Remove some debug meassages. Improve spectrum plot, code cleanups.

Function was completely rewritten. Fixed many clippy warnings and
reformatted code.

Works in principle but awfully slow because of resampling.

not yet tested.

Fix documentation code example.

Add export function for OpticNode / Optical.

Not working yet....

Update example accordingly.

no unit tests yet.